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(1) Explain why the temperature does not rise above its boiling point even when the flask is still heated, use the word thermal energy in your answer. (2) You and your lap partner, took melting point of the same sample. You observed a melting point ranging from 101°C to 107°C while your partner observed melting point ranging from 110°C to 112°C, explain why you have different melting point in the same sample. (3) An unidentify compound is observed to melt sharply at 111°C, with a vigorous evolution of a gas. The sample then solidifies and does not melt untill the temperature reaches 155°C, at which time will it melt sharply again? Briefly explain these observations.
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